Preparation and Photocatalytic Activity of Micro/nano-structured TiO2 Complexes
|Keywords||TiO2 photocatalyst Adsorption layer Micro / nanostructures Complexes Photocatalytic|
The semiconductor TiO 2 photocatalyst air purification, sewage treatment, self-cleaning glass, anti-fog and anti-bacterial and other fields has broad application prospects. Currently, the TiO 2 photocatalyst lower photocatalytic activity and low utilization of sunlight and other problems. In recent years, TiO 2 photocatalyst modification technology has been developing rapidly, including semiconductor compound, transition metal ion doping, nonmetal doping, noble metal deposition, the surface of the photosensitive method. This thesis focuses on nano-TiO 2 shortcomings, focus on nano-TiO 2 and other semiconductor composite using surface adsorption layer reaction successfully the nano TiO 2 and ZnO and CuO composite prepared micro / nanostructures ZnO / of TiO 2 and CuO / TiO 2 complexes and its photocatalytic activity . The main contents are as follows: first, summarized semiconductor photocatalyst TiO 2 photocatalytic reaction mechanism, and the TiO 2 photocatalyst research progress and its applications. Second, in order to make light HEALTH extend the life of the electronic and photo-generated holes, improve TiO 2 photocatalytic activity, similar to the band gap of ZnO composite. Zn (Ac) 2 and NaOH as raw materials, using the wet synthesis micron size flower-like and rod-like ZnO microcrystals, as nano TiO 2 carrier surface adsorption layer reaction success prepared micro / nanostructures ZnO / TiO 2 complexes. Third, in order to broaden the TiO 2 photocatalyst response range, and better separation of e - sup>-h sup> Dui improve the photocatalytic The quantum yield, and the bandgap narrower CuO composite. 6 sub the CuSO 4 · 5H 2 O NaOH and C , 6 of H 12 O > as the raw material, under atmospheric pressure to 70 ℃, without the case of any additive, the preparation of micron size spherical and cubic massive Cu 2 O microcrystalline, after heat treatment was spherical and cubes -like CuO, as nano-TiO 2 carrier surface adsorption layer reaction prepared micro / nanostructures CuO / TiO 2 complexes. Fourth, the photocatalytic experiments verify the photocatalytic activity of the composite photocatalyst. Simulated wastewater methyl orange micro / nanostructures ZnO / TiO 2 CuO / TiO 2 complexes uniform mixture of methyl orange solution, respectively, by high pressure mercury lamp or fluorescent light reaction, to study its photocatalytic properties. The experimental results obtained flower-like and rod of ZnO / TiO 2 composite catalyst molar ratio of 1:3 and 1:1 photocatalytic activity is best; spherical and cubic massive CuO / TiO < sub> 2 composite catalyst photocatalytic properties are composite ratio of 2:1. The best catalyst and catalytic activity of different concentrations of the catalyst, the initial concentration of different methyl orange photocatalytic effect.